PVA-280, PVA-350 and PVA-550
Prior to engine start, air pressure must be applied to these failsafe PVA valves to open to the engine run position. (Note, the external yellow indicator on the valve shows the position of the valve disc). Air pressure must be maintained between 4 and 6 bar (58 and 87 psi) to hold the intake valve fully open whilst the engine runs.

To carry out an emergency engine stop by closing the air intake valve, close down the air supply and vent the supply line. The valve will fully close once the air supply pressure at the valve falls below 2 bar.

PVA-281, PVA-351 and PVA-551
With no air pressure applied to these PVA valves they will be naturally sprung fully open and the engine may be run.

To carry out an emergency stop apply an air pressure of 4 to 6 bar (58 and 87 psi) to close the intake shut down valve.

The supply pressure must be vented before attempting to re-start the engine. This venting will happen automatically and at a controlled slow speed when kit SKA-100 and 24 Volt Solenoid SVA-200 are installed and the outlet vent device is adjusted correctly. The PVA valve will then return to open position allowing the engine to run.

Overview

PVA-280, PVA-350 and PVA-550 valves open on the application of air pressure. The ‘fail safe’ mode of operation of these models makes them suitable for use in zone 1 and 2 hazardous areas.

PVA-281, PVA-351 and PVA-551 close on the application of air pressure. This type of valve and Chalwyn control system is recommended for larger vehicles that have air brakes.

Features and Benefits

Simple direct air pressure operation

Build options to either open or close on the application of air pressure

Automatic reset on loss of air pressure

Valve status indicator (on top of actuator)

ATEX Certified - Ex II2G c TX x

Applications

PVA-280, PVA-350, PVA-550

Failsafe application to meet EU ATEX 94/9/EC defined hazardous areas

Zone 1 and 2 applications to EN 1834

International offshore platform engine installations

PVA-281, PVA-351, PVA-551

Petrochemical and LNG refineries

International areas where non-failsafe is permitted

Zone 2 fire pump engine offshore applications

Vehicles with air brakes

Fuel tankers

Emergency response vehicles

Vacuum trucks

Operation

PVA-280, PVA-350 and PVA-550
Prior to engine start, air pressure must be applied to these failsafe PVA valves to open to the engine run position. (Note, the external yellow indicator on the valve shows the position of the valve disc). Air pressure must be maintained between 4 and 6 bar (58 and 87 psi) to hold the intake valve fully open whilst the engine runs.

To carry out an emergency engine stop by closing the air intake valve, close down the air supply and vent the supply line. The valve will fully close once the air supply pressure at the valve falls below 2 bar.

PVA-281, PVA-351 and PVA-551
With no air pressure applied to these PVA valves they will be naturally sprung fully open and the engine may be run.

To carry out an emergency stop apply an air pressure of 4 to 6 bar (58 and 87 psi) to close the intake shut down valve.

The supply pressure must be vented before attempting to re-start the engine. This venting will happen automatically and at a controlled slow speed when kit SKA-100 and 24 Volt Solenoid SVA-200 are installed and the outlet vent device is adjusted correctly. The PVA valve will then return to open position allowing the engine to run.